Patent GB-190200642-A (GB)
Title: Method and Means for Generating Superheated Steam or Vapor.
Inventor: NEWCOMB EDWARD COVERLY
Filed: 1902-01-09
Granted: 1902-09-25
Abstract: 642. Newcomb, E. C. Jan. 9. Instantaneous generators; feedwater, controlling superheaters, steam. - Relates to coiled - tube instantaneous steam generators, more especially for motor cars, and to means for automatically controlling the supply of feed water and liquid fuel thereto in accordance with the pressure or temperature of the steam. The invention is stated to be applicable generally for the generatnn of superheated steam and vapuur. The generator consists of a number of coaxial conical coils of tubing, arranged as shown in Fig. 3, and connected together to form a continuous passage for the water and steam, the water entering through the outermost coil and the steam issuing from the innermost coi!, which serves as a superheater. The whole is enclosed in a casing, from the upper part of which a lateral chimney or escape flue leads in a downward direction. The exhaust steam from the engine is discharged through nozzles in the upper part of the chimney into a series of vertical tubes, to increase the draught. A hinged lid allows the products of combustion to escape at the top at starting. The supply of feed water may be controlled according to the pressure in the generator by fitting the feed pump, Fig. 6, with a spring piston 54 loaded to the maximum pressure. When the pressure in the generator exceeds the maximum, toe water forced by the pump plunger 47 simply lifts the piston 54 and does not leave the pump. The supply of liquid fuel may be controlled, in accordance with the supply of feedwater, by apparatus which comprises a spring-loaded piston exposed above to the pressure in the generaator and arranged to be lifted by the feedwater on its way to the generator. To regulate the temperature of the steam, the relative proportions of water and liquid fuel supplied may be varied by adjusting a valve in the fuel regulator, through which the feedwater passes, or by adjusting the connections between the pistons above referred to and the regulating needle of the fuel-supply nozzle. This may be done automatically by a thermostatic device in the steam supply pipe. Such a device may consist of a closed vessel partly filled with volatile liquid and connected to a Bourdon tube, by which the desired regulation may be effected. Fig. 12 shows another form of regulator, in which the feedwater valve 101 and the fuel valve 107 are simultaneously controlled, according to the pressure in the generator, by a spring-loaded piston 102, the fulcrum of the regulating-lever 108 being adjustable by a thermostatic device in the steam pipe 3 acting through the Bourdon tube 110, so as to vary the relative proportions of water and liquid fuel supplied. Fig. 14 shows a combined feed and liquid-fuel pump arranged to maintain a determined relation between the supplies of water and liquid fuel, and to control the supplies of both according to the pressure in the generator. The suction and delivery valves are not shown. The fuel plunger 131 is operated by adjustable tappets from the crosshead of the feed plunger 130, so that the stroke of the former may be varied. A spring-loaded relief valve 144 allows the feed water to return to the suction when the pressure in the generator rises above a certain limit, and this valve is connected by a lever 164 to a bye-pass valve in connection with the fuel pump, or to the suction valve of the latter, so that, when the feed-pump ceases to deliver water the supply of fuel is also stopped. In another arrangement of pump, the two plungers are connected to a common crosshead, and the stroke of each is invariable, but each pump is fitted with a spring- loaded piston, which, when a certain limit of pressure is exceeded, yields more or less so as to vary the effective displacement of the plungers. In a modification of this last arrangement, the fuel plunger is worked from the feed plunger by means of a lever, the fulcrum of which can be shifted so as to vary the relative strokes of the two plungers ; the spring-loaded pistons for varying the effective displacement of the two plungers are also connected by a similar lever, the fulcrum of which is simultaneously adjusted.